A quick google search shows that this error means “The specified service has been marked for deletion.” So for some reason the wizard hasn’t been able to completely delete the service. Seems that the easiest way to resolve this error is a quick reboot of the server, but to avoid getting it here’s a couple of checks:

Be sure to have closed all mmc instances on the server, including

Services

Event viewer

Close Task manager

I’m pretty sure there are other causes for the error as well, but again, in all cases a reboot should solve the issue.

Just in case anyone else gets this error – there is something else I just experience ( only took 10 uninstalls and reinstalls before I looked in the log file )

Action start 13:26:06: CA_BlockMissingWinFab.
MSI (s) (C0:4C) [13:26:06:346]: Product: Skype for Business Server 2015, Core Components — Skype for Business Server 2015, Core Components installation requires that Windows Fabric is already installed. Either use Setup.exe for installation or run WindowsFabricInstaller.msi included with the product to install the redistributable.